William l



-(N0 Model.)

W. 'L. DENIO.

' ELEGTRIQALTHERMOSTAT.

No. 478,788. Patented July 12, 1892.

QRWCmao-oco a i z w, 6. MM- WM 8 nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn c4 UNITED STATES PATENT OFFICE.

\VILLIAM L. DENIO, OF ROCHESTER, NEW YORK, ASSIGN OR TO THE STANDARD ELECTRIC SIGNAL COMPANY, OF SAME PLACE.

ELECTRICAL TH ERMOSTAT.

SPECIFICATION forming part Of Letters Patent NO. 478,788, dated July 12, 1892. Application filed December 8, 1891. Serial No. 414,370. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM L. DENIO, of Rochester, in the county of Monroe and State of New York, have invented a certain new and useful Improvement in Electrical Thermostats; and I do hereby declare that the following is a full, clear, and exact description of the same, reference beins. had to the drawings accompanying this specification.

My improvement relates to electric thermostats designed to open and then close the circuit automatically by the fusing of the solder that holds the parts together, all as hereinafter described.

In the drawings, Figure l is a side elevation of the thermostat located in an electric circuit. Fig. 2 is a longitudinal vertical section of the same.

a indicates the bodyof the thermostat, consisting of a block of rubber or other insulating material.

b l) are the two electrodes, consisting of metallic pieces attached to the insulator, simple screws being shown in the drawings. The wires h 7L, composing the circuit, are attached to these electrodes in any suitable manner, that shown being by means of the nuts that turn on the ends of the screws.

0 is an inner thimble attached permanently to one of the electrodes, and can outer thimble that slips loosely over the other and is secured thereto by solder that will fuse at a given temperaturesay 150 Fahrenheit. A spring d is interposed between the thimble, which tends to throw the outer thimble off. In case of fire the solderis fused at the given temperature and the outer thimble is thrown olf by the spring.

f is a conducting-spring attached to the other electrode, its lower end bearing against the outer thimble o. By this means the circuit is made from one wire to the other through the thermostat.

g is a shoulder formed on the outer thimble, preferably made of rubber or other insulating material. WVhen the outer thimble is thrown off, the shoulder g strikes the conducting-spring f, presses it out, and momentarily breaks the circuit; but when the thimble is thrown off clear from the other thimble the spring f springs back and comes in contact with the inner thimble and re-establishes the circuit again. The break is only momentary. The sliding of the outer thimble over the inner one cleans the surface of the latter, so that the contact of the spring is always certain.

This thermostat is applicable to various uses, but specially to fire-alarm systems, and I have illustrated its application to one purpose in my application for patent on electric signaling apparatus filed contemporaneously with this, in which the momentary break of the current by the thermostat sets in motion the signaling apparatus and the instantaneous re-establishment of the circuit renders the latter capable of receiving back a signal that the alarm has been sent into the fire department.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The thermostat herein described, consisting of the insulator a, the electrodes Z) Z), the thimbles c 0', attached to one of the electrodes and secured together by solder fusible at a given temperature, the spring d between the thimbles, which tends to throw the outer thimble off, the shoulder g on the outer thimble, and the spring f, attached to an electrode and bearing against the outer thimble, as shown and described, and for the purpose specified.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

W. L. DENIO. Witnesses:

R. F. OSGOOD,

P. A. OosTIoH. 

